Stretching frame for fibrous material



Aug. 21, 1928. 1,681,768

E. GMINDER' STRETCHING FRAME FOR FIBROUS MATERIAL I Filed Nov. 1 1, 192e- (Us wanton W 3511 Gamay Patented Aug. 21 1928.

' uurrso STATES EMIL eivriunnn, or nnurmueniv, GERMANY, P

STBETCHING FRAME FOR FIBROUS MATERIAL.

Application filed November 11, 1926. Serial No. 147,652, and in Germany December 19, 1925. 1

; ed for long fiber material such as cotton, flax,

straw fiber oakuin and straw oakum. Such fibrous material is often of such thickness that the intermeshing teeth of the upper and lower rollers are disengaged, causing irregularities and interruptions in the operation. t is not practical to design gears with teeth suiliciently long to prevent such disengagement with extra thick material.

In carrying out the present invention the upper floating rollers are driven by special gear wheels and which are so pos1tioned that they mesh with the gear wheels of the upper rollers but at the same time permit considerable vertical floating movement of the upper rollers without interrupting the drive or dis engaging the gears. Such auxiliary gears are located with their axes at substantially the same level as the gears of the upper rollers so that they mesh with the forwardly or rearwardly facing edge of the roller gears and each of the auxiliary or special gears may engage with and drive two oi the upper rollers, one upon each s1cle. VVlth this method of driving it is practically impossible for the gears to move out of mesh, even with comparatively thick material or 1rregular teeding. Thus it is possible with my improved apparatus to introduce flax, fiber oakum or straw oakum in roller stretcher spinning mills, as, for instance, cotton spinning mills.

In the accompanying drawing 1 have illustrated an apparatus employing my invention. In these drawings Figure 1 is a vertical longitudinal section through the series of rolls driven by the gearing; and

Figure 2 is a top plan view of one side portion of the machine. 7 p

In the'const-ruction illustrated there is employed a series of pairs of rollers, the lower rollers, 1, 2, S, L, and 5, being geared together so that they are positively driven, all in the same direction. The upper rollers, 1, 2, 3, 4 and 5, rest upon the corresponding lower rollers. The first and last rollers, 1 and 5,

"PA ENT mm;

are the pressurerollers of the teeding pair 1,

l and the delivery pair 5, 'lhe intermediaterollers 2 3 aud t? arefree tofloat I vertically to permit the passage of material of varying thicknesses. Thestretching field.

extends from the first to the last pair.

In carrying out my invention the upper rollers are driven independently of the lower rollers and thcreare provided auxiliary driving gears. The upper rollers 1 2, 3 and 4 are shown as provided with driving gears which mesh with intermediate driving gears 8 and 9. These have their axes at substantially the same elevation as the axes of the gears 10 and the gear 8 meshes with the gears 10 of the rollers 1 and 2, while the gear 9 meshes with the gears 10 of the rollers 3 and i. The rollers 8 and 9 have fixed axes or stub shat'ts while the gears 10 may float up and down with their corresponding rollers; thus the gears 10 may each raise through a considerable distance without disturbing the meshing relation to the corresponding gears 8 and 9. It will be noted that the gears 8 and 9each mesh with the gears 10 upon opposite sides, so that the number of these auxiliary gears 8 and 9 is reduced to a minimum. Obviously, there might be a separate gear such as 8 and 9 for each or the gears 10.

As the shaftso and 8 are stationary and their relationship to the axles of the lower rollers is not disturbed by any floating movement of the upper rollers, it is apparent that the shafts 6 andS may be driven from the same source of power as the lower rollers withconstant meshing engagement of all connecting gears. i

Ordinarily it is not necessary to drive the upper front roller 5 which rests on the roller 5 at the'delivery end of the apparatus. Furthermore, as a rule the fiber has become considerably thinner by the time it reaches this last pair of rollers and therefore if it is desired to drive the upper roller 5* it may be driven by the meshing of its own gear with that of the lower roller. The roller 5 may be driven by an auxiliary gear in the same way as are the other upper rollers if desired.

By means of my invention it is possible to secure the desired stretching effect in the upper rollers on a sliver or other fibrous material which is comparatively thick and without liability of unmeshing any of the gears which drive the several rollers.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

l. A stretching frame for fibrous material including a series of lower rollers, a series of upper rollers mounted for vertical floating 2. A stretehing frame for fibrous material, including a series of palrs'of rollers for action" in succession on the material, gears connected to the upper rollers, and auxiliary driving gears meshing therewith, the axis of each driving gear and the axis of the upper roller of the corresponding pair defining a plane substantially at right angles to the plane of the axes; Oftllfi rollers oi said pair whereby floating movement of the upper roller toward and from the lower roller doesnot affect, to any objectionable extent, its meshing engagement with its auxiliary driving'gear. I

Signed at Stuttgart, Germ-any, thislQth day of October, A. D; 1926.

E'Min GMINDER. 

